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371 lines
8.8 KiB
371 lines
8.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2012 Freescale Semiconductor, Inc. |
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* |
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* Copyright (C) 2014 Linaro. |
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* Viresh Kumar <[email protected]> |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/clk.h> |
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#include <linux/cpu.h> |
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#include <linux/cpufreq.h> |
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#include <linux/cpumask.h> |
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#include <linux/err.h> |
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#include <linux/list.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/pm_opp.h> |
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#include <linux/platform_device.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/slab.h> |
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#include <linux/thermal.h> |
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#include "cpufreq-dt.h" |
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struct private_data { |
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struct list_head node; |
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cpumask_var_t cpus; |
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struct device *cpu_dev; |
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struct opp_table *opp_table; |
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struct cpufreq_frequency_table *freq_table; |
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bool have_static_opps; |
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}; |
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static LIST_HEAD(priv_list); |
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static struct freq_attr *cpufreq_dt_attr[] = { |
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&cpufreq_freq_attr_scaling_available_freqs, |
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NULL, /* Extra space for boost-attr if required */ |
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NULL, |
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}; |
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static struct private_data *cpufreq_dt_find_data(int cpu) |
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{ |
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struct private_data *priv; |
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list_for_each_entry(priv, &priv_list, node) { |
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if (cpumask_test_cpu(cpu, priv->cpus)) |
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return priv; |
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} |
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return NULL; |
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} |
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static int set_target(struct cpufreq_policy *policy, unsigned int index) |
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{ |
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struct private_data *priv = policy->driver_data; |
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unsigned long freq = policy->freq_table[index].frequency; |
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return dev_pm_opp_set_rate(priv->cpu_dev, freq * 1000); |
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} |
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/* |
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* An earlier version of opp-v1 bindings used to name the regulator |
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* "cpu0-supply", we still need to handle that for backwards compatibility. |
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*/ |
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static const char *find_supply_name(struct device *dev) |
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{ |
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struct device_node *np; |
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struct property *pp; |
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int cpu = dev->id; |
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const char *name = NULL; |
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np = of_node_get(dev->of_node); |
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/* This must be valid for sure */ |
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if (WARN_ON(!np)) |
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return NULL; |
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/* Try "cpu0" for older DTs */ |
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if (!cpu) { |
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pp = of_find_property(np, "cpu0-supply", NULL); |
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if (pp) { |
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name = "cpu0"; |
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goto node_put; |
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} |
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} |
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pp = of_find_property(np, "cpu-supply", NULL); |
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if (pp) { |
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name = "cpu"; |
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goto node_put; |
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} |
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dev_dbg(dev, "no regulator for cpu%d\n", cpu); |
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node_put: |
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of_node_put(np); |
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return name; |
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} |
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static int cpufreq_init(struct cpufreq_policy *policy) |
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{ |
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struct private_data *priv; |
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struct device *cpu_dev; |
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struct clk *cpu_clk; |
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unsigned int transition_latency; |
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int ret; |
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priv = cpufreq_dt_find_data(policy->cpu); |
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if (!priv) { |
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pr_err("failed to find data for cpu%d\n", policy->cpu); |
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return -ENODEV; |
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} |
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cpu_dev = priv->cpu_dev; |
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cpu_clk = clk_get(cpu_dev, NULL); |
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if (IS_ERR(cpu_clk)) { |
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ret = PTR_ERR(cpu_clk); |
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dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret); |
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return ret; |
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} |
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transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev); |
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if (!transition_latency) |
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transition_latency = CPUFREQ_ETERNAL; |
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cpumask_copy(policy->cpus, priv->cpus); |
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policy->driver_data = priv; |
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policy->clk = cpu_clk; |
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policy->freq_table = priv->freq_table; |
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policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000; |
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policy->cpuinfo.transition_latency = transition_latency; |
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policy->dvfs_possible_from_any_cpu = true; |
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/* Support turbo/boost mode */ |
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if (policy_has_boost_freq(policy)) { |
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/* This gets disabled by core on driver unregister */ |
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ret = cpufreq_enable_boost_support(); |
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if (ret) |
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goto out_clk_put; |
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cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs; |
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} |
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dev_pm_opp_of_register_em(cpu_dev, policy->cpus); |
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return 0; |
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out_clk_put: |
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clk_put(cpu_clk); |
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return ret; |
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} |
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static int cpufreq_online(struct cpufreq_policy *policy) |
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{ |
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/* We did light-weight tear down earlier, nothing to do here */ |
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return 0; |
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} |
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static int cpufreq_offline(struct cpufreq_policy *policy) |
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{ |
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/* |
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* Preserve policy->driver_data and don't free resources on light-weight |
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* tear down. |
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*/ |
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return 0; |
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} |
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static int cpufreq_exit(struct cpufreq_policy *policy) |
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{ |
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clk_put(policy->clk); |
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return 0; |
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} |
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static struct cpufreq_driver dt_cpufreq_driver = { |
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.flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK | |
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CPUFREQ_IS_COOLING_DEV, |
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.verify = cpufreq_generic_frequency_table_verify, |
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.target_index = set_target, |
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.get = cpufreq_generic_get, |
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.init = cpufreq_init, |
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.exit = cpufreq_exit, |
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.online = cpufreq_online, |
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.offline = cpufreq_offline, |
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.name = "cpufreq-dt", |
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.attr = cpufreq_dt_attr, |
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.suspend = cpufreq_generic_suspend, |
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}; |
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static int dt_cpufreq_early_init(struct device *dev, int cpu) |
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{ |
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struct private_data *priv; |
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struct device *cpu_dev; |
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bool fallback = false; |
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const char *reg_name; |
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int ret; |
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/* Check if this CPU is already covered by some other policy */ |
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if (cpufreq_dt_find_data(cpu)) |
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return 0; |
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cpu_dev = get_cpu_device(cpu); |
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if (!cpu_dev) |
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return -EPROBE_DEFER; |
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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if (!alloc_cpumask_var(&priv->cpus, GFP_KERNEL)) |
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return -ENOMEM; |
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cpumask_set_cpu(cpu, priv->cpus); |
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priv->cpu_dev = cpu_dev; |
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/* |
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* OPP layer will be taking care of regulators now, but it needs to know |
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* the name of the regulator first. |
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*/ |
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reg_name = find_supply_name(cpu_dev); |
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if (reg_name) { |
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priv->opp_table = dev_pm_opp_set_regulators(cpu_dev, ®_name, |
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1); |
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if (IS_ERR(priv->opp_table)) { |
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ret = PTR_ERR(priv->opp_table); |
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if (ret != -EPROBE_DEFER) |
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dev_err(cpu_dev, "failed to set regulators: %d\n", |
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ret); |
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goto free_cpumask; |
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} |
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} |
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/* Get OPP-sharing information from "operating-points-v2" bindings */ |
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ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, priv->cpus); |
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if (ret) { |
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if (ret != -ENOENT) |
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goto out; |
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/* |
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* operating-points-v2 not supported, fallback to all CPUs share |
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* OPP for backward compatibility if the platform hasn't set |
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* sharing CPUs. |
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*/ |
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if (dev_pm_opp_get_sharing_cpus(cpu_dev, priv->cpus)) |
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fallback = true; |
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} |
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/* |
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* Initialize OPP tables for all priv->cpus. They will be shared by |
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* all CPUs which have marked their CPUs shared with OPP bindings. |
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* |
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* For platforms not using operating-points-v2 bindings, we do this |
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* before updating priv->cpus. Otherwise, we will end up creating |
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* duplicate OPPs for the CPUs. |
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* |
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* OPPs might be populated at runtime, don't check for error here. |
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*/ |
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if (!dev_pm_opp_of_cpumask_add_table(priv->cpus)) |
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priv->have_static_opps = true; |
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/* |
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* The OPP table must be initialized, statically or dynamically, by this |
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* point. |
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*/ |
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ret = dev_pm_opp_get_opp_count(cpu_dev); |
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if (ret <= 0) { |
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dev_err(cpu_dev, "OPP table can't be empty\n"); |
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ret = -ENODEV; |
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goto out; |
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} |
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if (fallback) { |
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cpumask_setall(priv->cpus); |
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ret = dev_pm_opp_set_sharing_cpus(cpu_dev, priv->cpus); |
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if (ret) |
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dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n", |
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__func__, ret); |
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} |
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ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &priv->freq_table); |
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if (ret) { |
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dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret); |
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goto out; |
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} |
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list_add(&priv->node, &priv_list); |
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return 0; |
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out: |
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if (priv->have_static_opps) |
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dev_pm_opp_of_cpumask_remove_table(priv->cpus); |
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dev_pm_opp_put_regulators(priv->opp_table); |
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free_cpumask: |
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free_cpumask_var(priv->cpus); |
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return ret; |
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} |
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static void dt_cpufreq_release(void) |
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{ |
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struct private_data *priv, *tmp; |
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list_for_each_entry_safe(priv, tmp, &priv_list, node) { |
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dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &priv->freq_table); |
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if (priv->have_static_opps) |
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dev_pm_opp_of_cpumask_remove_table(priv->cpus); |
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dev_pm_opp_put_regulators(priv->opp_table); |
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free_cpumask_var(priv->cpus); |
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list_del(&priv->node); |
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} |
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} |
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static int dt_cpufreq_probe(struct platform_device *pdev) |
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{ |
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struct cpufreq_dt_platform_data *data = dev_get_platdata(&pdev->dev); |
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int ret, cpu; |
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/* Request resources early so we can return in case of -EPROBE_DEFER */ |
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for_each_possible_cpu(cpu) { |
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ret = dt_cpufreq_early_init(&pdev->dev, cpu); |
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if (ret) |
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goto err; |
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} |
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if (data) { |
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if (data->have_governor_per_policy) |
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dt_cpufreq_driver.flags |= CPUFREQ_HAVE_GOVERNOR_PER_POLICY; |
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dt_cpufreq_driver.resume = data->resume; |
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if (data->suspend) |
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dt_cpufreq_driver.suspend = data->suspend; |
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if (data->get_intermediate) { |
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dt_cpufreq_driver.target_intermediate = data->target_intermediate; |
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dt_cpufreq_driver.get_intermediate = data->get_intermediate; |
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} |
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} |
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ret = cpufreq_register_driver(&dt_cpufreq_driver); |
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if (ret) { |
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dev_err(&pdev->dev, "failed register driver: %d\n", ret); |
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goto err; |
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} |
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return 0; |
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err: |
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dt_cpufreq_release(); |
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return ret; |
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} |
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static int dt_cpufreq_remove(struct platform_device *pdev) |
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{ |
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cpufreq_unregister_driver(&dt_cpufreq_driver); |
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dt_cpufreq_release(); |
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return 0; |
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} |
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static struct platform_driver dt_cpufreq_platdrv = { |
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.driver = { |
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.name = "cpufreq-dt", |
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}, |
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.probe = dt_cpufreq_probe, |
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.remove = dt_cpufreq_remove, |
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}; |
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module_platform_driver(dt_cpufreq_platdrv); |
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MODULE_ALIAS("platform:cpufreq-dt"); |
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MODULE_AUTHOR("Viresh Kumar <[email protected]>"); |
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MODULE_AUTHOR("Shawn Guo <[email protected]>"); |
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MODULE_DESCRIPTION("Generic cpufreq driver"); |
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MODULE_LICENSE("GPL");
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